Are you hearing a humming, growling or clicking noise? Noise is a classical sign of a worn wheel bearing and it is the first symptom that normally will be associated with vehicle speed. Why is it hard, as consumers, to identify a bad wheel bearing? Well some noises start out very gradually and over many days and months the noise becomes part of the background noise of the vehicle operation and they becomes hard to distinguish. Some of the wheel bearings are sealed and no adjustment is needed and other are adjustable and from time to time may need to check the adjustment and recheck for wheel bearing grease.